Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca03e16fcfed529…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 01:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0651392788748e88e082911f8c9b6f0e SHA-1: fc744f26b078b6f081a1c5d89def58a501209a21 SHA-256: aca03e16fcfed529b6e0fe3134a4e9923945d2ee19d2ba28a424d90f6849b1d7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the redirector and the sheer volume of links strongly suggest a malicious intent to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=giorgio+agamben+livros+pdf
    • http://files.kocanada-usa.com/uploads/1/3/1/4/131437538/zorodoke.pdf
    • http://files.herreraestrada.com/uploads/1/3/2/8/132815123/4132261.pdf
    • http://kufiwi.dwightjamesiii.com/uploads/1/3/0/8/130813765/vekisulexokapuj.pdf
    • http://files.tibetanfirepalm.com/uploads/1/3/1/4/131452903/rigufusafobokanot.pdf
    • http://namexerom.adriendemeure.com/uploads/1/3/1/3/131380213/de3abe1a04d502.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/rogipazidawutikikimej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/rodik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/854659895.pdf
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/watch_the_avengers_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/0758/9027/files/sobemuxogukexigupige.pdf
    • https://cdn.shopify.com/s/files/1/0449/8921/8984/files/common_sense_book_by_soham_swami.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/stanley_garage_door_opener.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/powuve.pdf
    • https://cdn.shopify.com/s/files/1/0437/6182/8001/files/46512701823.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0276/files/catharanthus_roseus_review.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b13.bin
0229325408ffd8035469992a0be07f3795c1d371d9c933349ddee60cf3aebe05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 5592 bytes
font_01_sfnt_off00007e03.bin
853af6ae387cb9c605c8b63afc10a9a08652b87f0f05d8a556e53ce711b62633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E03 10192 bytes

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